My trust in them has dropped significantly with the recent events.

You can't have privacy without security, and security requires every piece to be secure, not just the backend. All your emails are one xss away from being dumped, regardless of whatever encryption is used.
Why should I trust them to make secure products when their culture is to bully the employees who suggest testing the security of these products?

Aside from not wanting to support the shitty behaviour of mocking their employees, I can't even trust that they're taking security seriously anymore.

If you believe it was a simple mistake and that they'll take things more seriously going forward, that's up to you.
But personally I'm looking into setting up a self-hosted system before my current subscription ends. Can't trust anyone these days.